Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements (USD $)	Dec. 31, 2014	Dec. 31, 2013
Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements [Line Items]
Wholesale repurchase agreements	$ 150,282,492	$ 142,448,362
Wholesale Repurchase Agreements [Member] | Maturing in Next 12 Months [Member]
Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements [Line Items]
Wholesale repurchase agreements	5,000,000	5,000,000
Weighted average interest rate at year-end	2.77%	2.77%
Wholesale Repurchase Agreements [Member] | Maturing in 2017 [Member]
Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements [Line Items]
Wholesale repurchase agreements	10,000,000	10,000,000
Weighted average interest rate at year-end	3.00%	3.00%
Wholesale Repurchase Agreements [Member] | Maturing in 2018 [Member]
Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements [Line Items]
Wholesale repurchase agreements	10,000,000	10,000,000
Weighted average interest rate at year-end	3.97%	3.97%
Wholesale Repurchase Agreements [Member] | Maturing in 2019 [Member]
Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements [Line Items]
Wholesale repurchase agreements	60,000,000	60,000,000
Weighted average interest rate at year-end	3.57%	3.57%
Wholesale Repurchase Agreements [Member] | Maturing Thereafter [Member]
Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements [Line Items]
Wholesale repurchase agreements	45,000,000	45,000,000
Weighted average interest rate at year-end	2.66%	2.66%
Wholesale Repurchase Agreements [Member]
Note 10 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements [Line Items]
Wholesale repurchase agreements	$ 130,000,000	$ 130,000,000
Weighted average interest rate at year-end	3.21%	3.21%